CN209728185U - A kind of block form double energy X-ray detector - Google Patents
A kind of block form double energy X-ray detector Download PDFInfo
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- CN209728185U CN209728185U CN201821708702.5U CN201821708702U CN209728185U CN 209728185 U CN209728185 U CN 209728185U CN 201821708702 U CN201821708702 U CN 201821708702U CN 209728185 U CN209728185 U CN 209728185U
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Abstract
The utility model discloses a kind of block form double energy X-ray detector, including the low energy probe unit and high energy probe unit being correspondingly arranged.Wherein, low energy probe unit includes the first filter plate, low energy scintillator arrays and the first photodiode array set gradually along ray incident direction, high energy probe unit includes the second filter plate, high energy scintillator arrays and the second photodiode array set gradually along ray incident direction, wherein low energy scintillator and high energy scintillator are arranged in parallel in the plane perpendicular to ray incidence, the pixel central point line of high and low energy probe unit corresponding channel is perpendicular to pixel orientation, wherein the first filter plate is the filter plate with quantum effect.
Description
Technical field
The utility model relates to the field of radiation detection technology.It is detected more particularly, to a kind of block form double energy X-ray
Device.
Background technique
X-ray is the very short electromagnetic wave of wavelength, has very high penetrating power, can penetrate many opaque to visible light
Substance.This invisible ray can make many materials that visible fluorescence occur, and keep photographic negative photosensitive and air
The effects such as ionization.
When being detected using X-ray, after X-ray penetrates tested object, power spectrum can be hardened, hardenability and tested
The material composition of object and the thickness of penetration direction are related.Traditional linear array double energy X-ray detector is by low and high energy two
A detector is arranged successively composition along ray incident direction, and low energy detector array is disposed adjacent to the side of tested object,
The main low energy part absorbed in X-ray energy spectrum, high energy array detector arrangement is in low energy detector array back, main absorption
Energetic portions in X-ray energy spectrum.A filtering is generally also configured between low energy detector array and high energy array detector
Piece further absorbs remaining low energy part in X-ray energy spectrum.
On the one hand, this detector is easy for installation, high and low energy pixel registration is simple, but to guarantee to be in directions of rays
Absorption of the high energy scintillator in downstream to high-energy ray, can not be arranged filter plate on low energy scintillator and penetrate to filter out part high energy
Line, and entire low energy unit will affect absorption of the high energy scintillator to ray to the decaying of ray.On the other hand, this tradition
The high and low of linear array double energy X-ray detector can be according to scintillator pixel between the corresponding scintillator arrays of detector
Central point aligns, but this for common GOS film low energy scintillator, between pixel and unglazed every but relying on
The characteristic of this material translucence and photodiode coupled thereto (having dead zone among two adjacent photodiodes)
To realize being generally isolated for adjacent signals.But it is not easy accurate contraposition in this way, especially it is active mainly to receive its for photodiode
Area's light that nearby about half millimeter of scintillator generates.Therefore, when coupling, the geometric center point and photodiode of GOS film
When the central point deviation of pixel is larger, will lead to high and low energy channel can not sample in same ray position.
In this case, accurate way should be high and low energy scintillator parallel arranged, and with the first photodiode
Active area central point to be aligned with high energy with the scintillator cells central point of optical confinement layer.Therefore traditional this arrangement mode
It is not flexible, and pixel alignment methods are unfavorable for accomplishing the high and low energy channel in linear array double energy X-ray detector same
Ray position sampling, and then will affect the capabilities for material recognition of scanning system.
Accordingly, it is desirable to provide a kind of novel double energy X-ray detector.
Utility model content
The purpose of this utility model is to provide one kind can filter out part high-energy ray and high and low energy corresponding channel
Pixel interlacing is matched and is aligned, in different time but the substantive block form double energy X-ray detection in the sampling of same ray position
Device exports original picture signal using block form double energy X-ray detector, and processing system is based on above-mentioned original image letter
Number, transmittance of the object under two different-energies is compared, low energy part and height in the X-ray energy spectrum for penetrate object are calculated
The relative difference of energy part, and then the foundation of material identification is provided.
In order to achieve the above objectives, the utility model adopts the following technical solutions:
A kind of block form double energy X-ray detector, including the low energy probe unit and high energy probe unit being correspondingly arranged,
Wherein:
Low energy probe unit, including set gradually along ray incident direction the first filter plate, low energy scintillator arrays and
First photodiode array, the first photodiode array are used to detect the optical signal of low energy scintillator arrays sending and conversion
For the electric signal of low energy probe unit；
High energy probe unit, including set gradually along ray incident direction the second filter plate, high energy scintillator arrays and
Second photodiode array, the second photodiode array are used to detect the optical signal of high energy scintillator arrays sending and conversion
For the electric signal of high energy probe unit；
High and low energy scintillator is arranged in parallel in the plane perpendicular to ray incident direction, the pixel central point of corresponding channel
Line is perpendicular to directions of rays while also being normal to pixel orientation；
Primary light on low energy probe unit every each pixel central point of device in corresponding each pixel of high energy scintillator arrays
The alignment of heart point, wherein
When low energy scintillator arrays have light every when, primary light every device be low energy scintillator arrays；
When low energy scintillator arrays it is unglazed every when, primary light every device be the first photodiode array.
First filter plate is set above low energy scintillator to filter out part high-energy ray.
Preferably, the first filter plate select have quantum effect filtering material, including metal molybdenum, metallic silver, metallic tin,
One or more of barium metal, tungsten, gold, metallic lead or above-mentioned metal and alloy of other elements combine.
Second filter plate is set above high energy probe unit, for absorbing low energy part in X-ray energy spectrum.
Preferably, the material of filter plate be metallic copper, metal molybdenum, metallic silver, metallic tin, barium metal, tungsten, gold or on
One or more of metal and the alloy of other elements is stated to combine.
Preferably, low energy scintillator material are as follows: GOS film, GOS ceramics, CsI (T1), CdWO4 or ZnSe.
Preferably, high energy scintillator material are as follows: GOS ceramics, CsI (T1), CdWO4 or ZnSe.
Preferably, the energy of the x-ray photon of sedimentary energy is lower than in high energy scintillator arrays in low energy scintillator arrays
The energy of the x-ray photon of middle sedimentary energy.
The beneficial effects of the utility model are as follows:
In the utility model, in the plane vertical with ray incident direction, low energy array detection unit and high energy array
Probe unit is arranged in parallel, and energy filter piece is respectively set above high and low energy scintillator, especially realizes and penetrates to part high energy
The filtering of line, and then improve the ray separating degree that high and low energy scintillator is absorbed；
In addition, between high and low energy corresponds to pixel, on X-ray incident path, the device that there is pixel to be isolated according to first
Pixel central point is mutually aligned.In particular, when low energy scintillator is without isolation, each pixel central point of the first photodiode array
It is aligned with corresponding high energy scintillator pixel central point.
Due to being provided with the first filter plate, and low energy detector array and high energy detector array above low energy scintillator
Contraposition is accurate, so being conducive to improve ray scanning system to the recognition capability of material.
Detailed description of the invention
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 shows double energy X-ray panel detector structure schematic diagram in the prior art.
Fig. 2 shows a kind of block form double energy X-ray panel detector structure schematic diagrames.
Specific embodiment
In order to illustrate more clearly of the utility model, the utility model is done into one below with reference to preferred embodiments and drawings
The explanation of step.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that below
Specifically described content is illustrative and be not restrictive, and should not be limited the protection scope of the present invention.
Belong to " first ", " second " etc. in the specification and claims of the utility model and above-mentioned attached drawing are to be used for
Different objects is distinguished, is not use to describe a particular order.In addition, term " includes " and " having " and their any changes
Shape, it is intended that cover and non-exclusive include.Such as contain the process, method of a series of steps or units, system, product or
Equipment is not limited to listed step or unit, but optionally further comprising the step of not listing or unit or optional
Ground further includes the specific steps or unit intrinsic for these process, methods or equipment.
Fig. 1 shows the schematic diagram of the dual energy X ray detector of traditional technology.Traditional linear array double energy X-ray detection
Device is made of two detectors of high and low energy.Low energy detector array is disposed adjacent to the side of tested object, mainly absorbs X
Low energy part in ray energy spectrum, high energy array detector arrangement mainly absorb X-ray energy spectrum in low energy detector array back
In energetic portions.A filter plate is generally also configured between low energy detector array and high energy array detector to come further
Absorb remaining low energy part in X-ray energy spectrum.
When detection, X-ray 100 initially enters low energy scintillator 131 and sedimentary energy releases visible light wherein, with sudden strain of a muscle
The photoelectric detector 141 of bright body coupling is it will be seen that optical signal is converted into electric signal.Without the X-ray with the effect of low energy scintillator
It is further reduced the low energy part in X-ray energy spectrum across filter plate 122, X-ray is complete inside high energy scintillator 132 later
It absorbs, the visible light released is converted into electric signal in photoelectric detector 142.Electric signal be connected to signal amplification and
Data converting circuit.This detector is easy for installation, high and low energy pixel registration is simple, but registration accuracy is low, and dodges in low energy
Filter plate can not be configured on bright body to filter out unwanted high-energy ray.
In the utility model, a kind of block form double energy X-ray detector, including the low energy probe unit that is correspondingly arranged and
High energy probe unit, beam 200 passes through entrance window 211 and the slit of collimator 212 arrives separately at low energy and high energy detection list
Member.Wherein: low energy probe unit includes the first filter plate 221 set gradually along 200 incident direction of ray, low energy scintillator battle array
Column 231 and the first photodiode array 241, the first photodiode array are used to detect the light of low energy scintillator arrays sending
Signal and the electric signal for being converted into low energy probe unit；High energy probe unit includes second set gradually along ray incident direction
Filter plate 222, high energy scintillator arrays 232 and the second photodiode array 242, the second photodiode array is for detecting
Optical signal that scintillator arrays issue simultaneously is converted into electric signal and through subsequent amplification and processing.
In the utility model, low energy scintillator and high energy the scintillator parallel in the plane perpendicular to ray incident direction
Column, the primary light of low energy probe unit are aligned every each pixel central point of device with the corresponding pixel central point of high energy scintillator arrays,
Wherein,
When low energy scintillator arrays have light every when, primary light every device be low energy scintillator arrays；
When low energy scintillator arrays it is unglazed every when, primary light every device be the first photodiode array.
Detector is applied in linear scanning system, and scanned object opposing detector moves line by line, moving direction perpendicular to
Radiation exposure direction, the direction being arranged in rows both perpendicular to pixel.The high and low energy pixel signal interlacing of corresponding channel matches, institute
Interlacing number line width quantity corresponding to the distance between high and low energy pixel central point determines.
For metallic atom in most of energy section of X-ray, the photoelectric absorption coefficient to X-ray is monotonic decreasing, right
The radiation absorption of higher-energy is small, therefore filter disc made of the materials such as common copper can not filter relatively more high-energy rays.
Therefore the atom K layers of higher element of (i.e. innermost layer) electron ionization energy is selected using quantum theory for low energy probe unit,
There is the characteristic of jump to the X-ray photoelectric absorption of corresponding energy using it, it is strong to the X-ray absorption of the energy and higher energy
It is strong, most of high-energy ray is selectively filtered out, while only absorbing the middle low-energy X-ray of relatively small amount, to improve double
The high and low energy ray separating degree of energy detector.
Based on the above content, the material of the first filter plate be metal molybdenum, metallic silver, metallic tin, barium metal, tungsten, gold,
The alloy of metallic lead or above-mentioned metal and other elements.
The material of second filter plate is metallic copper, metal molybdenum, metallic silver, metallic tin, barium metal, tungsten, gold or above-mentioned
The alloy of metal and other elements, effectively filters out low energy X ray, further improves the high and low energy ray separation of dual-energy detector
Degree.
Low energy scintillator material are as follows: GOS film, GOS ceramics, CsI (T1), CdWO4 or ZnS.
High energy scintillator material are as follows: GOS ceramics, CsI (T1), CdWO4 or ZnSe.
It should be noted that the energy of the x-ray photon of sedimentary energy is lower than in high energy scintillator in low energy scintillator arrays
The energy of the x-ray photon of sedimentary energy in array.
Since traditional linear array double energy X-ray detector is along ray incident direction successively longitudinal arrangement, nothing
Filter plate is arranged above low energy scintillator in method；And high and low can be according to scintillator pixel between the corresponding pixel of detector
Central point aligns, but this for common GOS film low energy scintillator, between scintillator pixel and it is unglazed every, and
It is (to have among two adjacent photodiodes by the characteristic and photodiode coupled thereto of this material translucence
Dead zone) Lai Shixian adjacent signals are generally isolated.But it is not easy accurate contraposition in this way, especially photodiode mainly receives it
The active area light that nearby about half millimeter of scintillator generates, therefore, when coupling, the geometric center point and photoelectricity two of GOS film
When the central point deviation of pole pipe pixel is larger, will lead to high and low energy channel can not sample in same ray position.
In the utility model, high and low energy scintillator is arranged using block form, can be neatly arranged on low energy scintillator
First filter plate filters out the unwanted sigmatron of low energy scintillator；In addition, according to low energy scintillator with the presence or absence of light every next
Determine primary light every device be low energy scintillator arrays or the first photodiode array, low energy unit is according to primary light every device
Each pixel central point is aligned with the corresponding pixel central point of high energy scintillator arrays and interlacing matching, realizes high and low energy channel and exists
Same ray position sampling, improves ray scanning system to the recognition capability of material.
It is worth noting that, included each unit is only carried out according to function logic in the utility model embodiment
It divides, but is not limited to the above division, as long as corresponding functions can be realized；In addition, the tool of each functional unit
Body title is also only for convenience of distinguishing each other, the protection scope being not intended to limit the utility model.
" multiple " referred in the utility model embodiment refer to two or more."and/or" describes affiliated partner
Incidence relation, indicate may exist three kinds of relationships, for example, A and/or B, can indicate: individualism A exists simultaneously A and B,
These three situations of individualism B.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention, for those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways, all embodiments can not be exhaustive here,
It is all to belong to obvious changes or variations that the technical solution of the utility model is extended out still in the utility model
The column of protection scope.
Claims (7)
1. a kind of block form double energy X-ray detector, which is characterized in that including the low energy probe unit being correspondingly arranged and high energy
Probe unit, in which:
Low energy probe unit, including the first filter plate, the low energy scintillator arrays and first set gradually along ray incident direction
Photodiode array, first photodiode array are used to detect the optical signal of the low energy scintillator arrays sending simultaneously
It is converted into the electric signal of the low energy probe unit；
High energy probe unit, including the second filter plate, the high energy scintillator arrays and second set gradually along ray incident direction
Photodiode array, second photodiode array are used to detect the optical signal of the high energy scintillator arrays sending simultaneously
It is converted into the electric signal of the high energy probe unit；
The low energy scintillator and high energy scintillator are arranged in parallel in the plane perpendicular to ray incident direction, high and low energy detection
The pixel central point line of unit corresponding channel is perpendicular to pixel orientation；
The primary light of low energy probe unit is every each pixel central point of device and the corresponding high energy scintillator arrays pixel central point
Alignment, wherein
When low energy scintillator arrays have light every when, the primary light every device be the low energy scintillator arrays；
When low energy scintillator arrays it is unglazed every when, the primary light every device be first photodiode array；
The first filter plate with quantum effect being arranged above the low energy scintillator is used to filter out part high-energy ray；
The second filter plate being arranged above the high energy scintillator is used to filter out part low energy ray.
2. block form double energy X-ray detector according to claim 1, which is characterized in that described that there is quantum effect
The first filter plate material be metal molybdenum, metallic silver, metallic tin, barium metal, tungsten, gold, metallic lead or above-mentioned metal with
The alloy of other elements.
3. block form double energy X-ray detector according to claim 1, which is characterized in that second filter plate
Material is the alloy of metallic copper, metal molybdenum, metallic silver, metallic tin, barium metal, tungsten, gold or above-mentioned metal and other elements.
4. block form double energy X-ray detector according to claim 1, which is characterized in that the low energy scintillator material
Material are as follows: GOS film, GOS ceramics, CsI (T1), CdWO4 or ZnSe.
5. block form double energy X-ray detector according to claim 1, which is characterized in that the high energy scintillator material
Material are as follows: GOS ceramics, CsI (T1), CdWO4 or ZnSe.
6. block form double energy X-ray detector according to claim 1, which is characterized in that in the low energy scintillator
X-ray photon of the energy of the x-ray photon of sedimentary energy lower than the sedimentary energy in the high energy scintillator arrays in array
Energy.
7. block form double energy X-ray detector according to claim 1, which is characterized in that the height of the corresponding channel
Low energy pixel signal interlacing matching, institute's interlacing number line width quantity corresponding to the distance between pixel central point determine.
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| CN112117290A (en) * | 2020-09-24 | 2020-12-22 | 京东方科技集团股份有限公司 | Ray detector substrate and ray detector |
| CN112213765A (en) * | 2020-10-13 | 2021-01-12 | 中国工程物理研究院激光聚变研究中心 | Pulse field proton energy spectrum measuring instrument |
| CN112415028A (en) * | 2020-11-19 | 2021-02-26 | 同源微（北京）半导体技术有限公司 | X-ray detector and detection system |
| CN112730479A (en) * | 2020-12-24 | 2021-04-30 | 北京航星机器制造有限公司 | Dual-energy CT detector, CT detection system and detection method |
| CN112748133A (en) * | 2020-12-24 | 2021-05-04 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| WO2024094226A1 (en) * | 2023-06-26 | 2024-05-10 | 中广核工程有限公司 | Dual-energy x-ray detector structure and dual-energy x-ray detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112117290A (en) * | 2020-09-24 | 2020-12-22 | 京东方科技集团股份有限公司 | Ray detector substrate and ray detector |
| WO2022062696A1 (en) * | 2020-09-24 | 2022-03-31 | 京东方科技集团股份有限公司 | Ray detector substrate and ray detector |
| CN112117290B (en) * | 2020-09-24 | 2023-11-24 | 京东方科技集团股份有限公司 | Radiation detector substrate and radiation detector |
| CN112213765A (en) * | 2020-10-13 | 2021-01-12 | 中国工程物理研究院激光聚变研究中心 | Pulse field proton energy spectrum measuring instrument |
| CN112415028A (en) * | 2020-11-19 | 2021-02-26 | 同源微（北京）半导体技术有限公司 | X-ray detector and detection system |
| CN112730479A (en) * | 2020-12-24 | 2021-04-30 | 北京航星机器制造有限公司 | Dual-energy CT detector, CT detection system and detection method |
| CN112748133A (en) * | 2020-12-24 | 2021-05-04 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| CN112730479B (en) * | 2020-12-24 | 2023-04-11 | 北京航星机器制造有限公司 | Dual-energy CT detector, CT detection system and detection method |
| CN112748133B (en) * | 2020-12-24 | 2023-06-16 | 北京航星机器制造有限公司 | High-energy sparse CT detector, CT detection system and detection method |
| WO2024094226A1 (en) * | 2023-06-26 | 2024-05-10 | 中广核工程有限公司 | Dual-energy x-ray detector structure and dual-energy x-ray detection method |
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